Hi,
I put burn slots in the squish area of my first cylinder head recently. Unfortunately I have no photos of the work as my camera was not working. Basically the engine spec remained the same except for this work. I put one slot on the squish pad at the opposite side of the chamber from the spark plug pointing at the spark plug and I put one behind the spark plug which was tangential to the edge of the spark plug. I have no before and after dyno results but the feedback from the driver is that the idle is much smoother and the ability of the engine to pull from low revs is much improved. A dead spot most likely caused by bad carburettor setup has virtually disappeared. The high rpm performance does not appear to have changed at all. I am very pleased with the results and am contemplating doing it on future builds. Unfortunately this is more anecdotal evidence with no real numbers to back it but all I have for the moment
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Best Regards
Tom